Image:High altitude EMP2.GIF

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[edit] Summary

Image composed of the calculations on pages 33 and 36 of Louis W. Seiler, Jr., A Calculational Model for High Altitude EMP, AIR FORCE INST. OF TECH., WRIGHT-PATTERSON A.F.B., U.S. Government report number AD-A009208, March 1975, available online at http://stinet.dtic.mil/cgi-bin/GetTRDoc?AD=A009208&Location=U2&doc=GetTRDoc.pdf Background information on high altitude EMP from testing is from http://glasstone.blogspot.com/2006/03/emp-radiation-from-nuclear-space.html Note that the actual peak EMP at ground zero depends also on the intensity and hence the rise time of the prompt gamma rays, and the natural magnetic field strength at the altitude of interest, so these are just approximate curves. The blue pre-ionisation curve shows how gamma rays from the primary stage of a nuclear weapon can reduce the later stage EMP by partly shorting it out, via pre-ionising the high altitude atmosphere (which allows a conduction current to immediately oppose the EMP Compton current of electrons). The full facts are secret, but these unclassified curves give a good idea of how bomb yield and burst altitude influence the maximum peak EMP on the earth's surface.

[edit] Licensing

This work is in the public domain in the United States because it is a work of the United States Federal Government under the terms of Title 17, Chapter 1, Section 105 of the US Code. See Copyright. Note: This only applies to works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision.

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